EP0248580B1 - Mikrowellenkochgerät - Google Patents

Mikrowellenkochgerät Download PDF

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Publication number
EP0248580B1
EP0248580B1 EP87304625A EP87304625A EP0248580B1 EP 0248580 B1 EP0248580 B1 EP 0248580B1 EP 87304625 A EP87304625 A EP 87304625A EP 87304625 A EP87304625 A EP 87304625A EP 0248580 B1 EP0248580 B1 EP 0248580B1
Authority
EP
European Patent Office
Prior art keywords
air
reflecting
cooking
zone
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP87304625A
Other languages
English (en)
French (fr)
Other versions
EP0248580A2 (de
EP0248580A3 (en
Inventor
Makoto C/O Patent Division Nagafusa
Yoshitoshi C/O Patent Division Hirate
Minoru C/O Patent Division Takagi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP61126369A external-priority patent/JPH07101099B2/ja
Priority claimed from JP61126368A external-priority patent/JPS62283593A/ja
Application filed by Toshiba Corp filed Critical Toshiba Corp
Publication of EP0248580A2 publication Critical patent/EP0248580A2/de
Publication of EP0248580A3 publication Critical patent/EP0248580A3/en
Application granted granted Critical
Publication of EP0248580B1 publication Critical patent/EP0248580B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/72—Radiators or antennas
    • H05B6/725—Rotatable antennas
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/642—Cooling of the microwave components and related air circulation systems

Definitions

  • the present invention relates, in general, to cooking apparatus.
  • the invention relates to a microwave cooking apparatus wherein a magnetron for generating microwaves and a rotatable device for reflecting the microwaves from the magnetron into a cooking chamber are employed.
  • microwave cooking apparatus such as microwave ovens, typically include a fan device for cooling electric components, such as, e.g., a magnetron, a transformer, etc., and for ventilating the cooking chamber.
  • the microwave cooking apparatus also generally includes a rotatable reflector arranged between the magnetron and the cooking chamber for reflecting microwaves from the magnetron. The reflector is rotated by the force of cooling air generated by the fan device. Thus, the microwaves reflected by the reflector are uniformly fed to the cooking chamber.
  • a reflecting chamber in which a rotatable reflector is disposed is provided on a cooking chamber. Some of the cooling air generated by a fan device is directed to the reflecting chamber. The remaining cooling air is supplied to a magnetron for cooling the magnetron, and then is fed to the reflecting chamber.
  • U.S. Patent 4,556,772 discloses an arrangement in which all the cooling air from a fan passes first through the chamber having the magnetron and thereafter a portion passes to the reflecting chamber before entering the cooling chamber. A large capacity fan device is required in this device.
  • U.S. Patent 4,296,297 has a microwave reflector driven by a fan and this fan is driven by a portion of air from a blower. There is no indication of the inlet position for the air and the air reaches the fan via the chamber having the magnetron.
  • the present invention seeks to provide sufficient air to the reflecting chamber and the cooking chamber of a microwave cooking apparatus at a sufficient pressure with a fan device having a small capacity fan motor.
  • a microwave cooking apparatus comprising an outer casing; a heating compartment having a reflecting zone and a cooking zone for receiving food to be cooked; a magnetron for generating microwaves radiated to the reflecting zone in the heating compartment; a rotatable reflector in the reflecting zone for reflecting the microwaves onto the food in the cooking zone; an air intake opening; a fan device for supplying air under pressure from the air intake opening into the heating compartment; a duct device separating the supplied air into at least a first flow path for a portion of the air for rotating the reflector; and a second flow path by-passing the reflecting zone and communicating a portion of the air to the cooking zone for ventilating the cooking zone, and an air discharge path with an air exhaust opening for exhausting the air from the heating compartment to the outside of the cooking apparatus, characterised in that the said first flow path portion of air is communicated directly from the fan device to the reflecting zone to rotate the reflector, and that the bottom wall of the outer casing has an outwardly extending convex portion
  • the microwave cooking apparatus may include a partition wall for defining a reflecting chamber as the reflecting zone and a cooking chamber as the cooking zone in the heating compartment.
  • the reflecting chamber may be provided with an air guide for concentrating the air from the first flow path onto the reflector.
  • the microwave cooking apparatus further includes an exhausting passage for exhausting the air from the cooking apparatus.
  • the exhausting passage may be provided with a deflection plate for directing the exhausted air from the cooking apparatus.
  • FIGURE 1 is a longitudinal sectional view of a microwave oven of one embodiment.
  • a heating compartment 11 is disposed in an oven body 13. Heating compartment 11 is partitioned into a cooking chamber 15 and a reflecting chamber 17 with a plastic partition wall 19 disposed across heating compartment 11. Reflecting chamber 17 is positioned on cooking chamber 15.
  • the ceiling of reflecting chamber 17 is upwardly concaved, and hereupon a reflector 21 is rotatably suspended.
  • Reflector 21 includes a cross-shaped deflecting plate 21a, as shown in FIGURE 2.
  • a perpendicular fan-like blade 21b extends upward from the edge of each elongated arm portion 21c of cross-shaped deflecting plate 21a.
  • Reflector 21 is rotatably supported by a stationary shaft 23 downwardly projecting from the ceiling of reflecting chamber 17.
  • the bottom portion of cooking chamber 15 is concaved downward, and a tray 25 is laid across the concaved bottom portion of cooking chamber 15.
  • a machinery chamber 27 is established between the right side wall of heating compartment 11 and the outer wall of body 13, as shown in FIGURES 1 and 2.
  • a plurality of air intake holes 29 are formed at the front side of the bottom surface of oven body 13 within machinery chamber 27, as shown in FIGURES 2 and 3.
  • a high-voltage transformer 31 is arranged on the bottom surface of oven body 13 near air intake holes 29.
  • a magnetron 33 exposed to machinery chamber 27 is mounted on the upper center portion of the right side wall of heating compartment 11.
  • the antenna 35 of magnetron 33 penetrates the right side wall of heating compartment 11, and projects inside of reflecting chamber 17.
  • a fan device 37 is disposed in the area adjacent to transformer 31 in machinery chamber 27.
  • Fan device 37 includes a fan casing 39 in which fan 41 is positioned, and a motor 43 for driving fan 41.
  • Fan casing 39 includes an air intake port 39a and an air discharge port 39b.
  • Fan casing 39 is arranged in machinery chamber 27 so that air intake port 39a faces transformer 31, and air discharge port 39b opens upward, as shown in FIGURES 1 and 3.
  • a plurality of first through holes 45 are provided to the side wall of heating compartment 11 at the right-hand side of magnetron 33.
  • a plurality of second through holes 47 are provided to the side wall of heating compartment 11 at the left-hand side of magnetron 23.
  • the surface area of partition wall 19 adjacent to first through holes 45 and antenna 35 of magnetron 33 is concaved toward cooking chamber 15 to expose first through holes 45 and antenna 35 to reflecting chamber 17.
  • Second through holes 47 are exposed to cooking chamber 15.
  • An air guide plate 49 is disposed between first through holes 45 and antenna 35 of magnetron 33 in reflecting chamber 17.
  • a first duct cover 51 is provided between magnetron 33 and an discharge port 39b of fan casing 39 to establish a first air path 53 therebetween.
  • the air from air discharge port 39b of fan casing 39 is supplied to reflecting chamber 17 through first through holes 45 along first air path 53.
  • the air from fan casing 39 is also supplied to magnetron 33.
  • a second duct cover 55 is provided between magnetron 33 and second through holes 47.
  • a second air path 57 is defined by second duct cover 55 and the side wall of cooking compartment 11.
  • the air from magnetron 33 is guided by second duct cover 55, and is supplied to cooking chamber 15 through second through holes 47.
  • the distance between second duct cover 55 and the side wall of heating compartment 11 is preferably gradually reduced from magnetron 33 toward the front side of oven body 13.
  • the air from magnetron 33 may concentrate to second through holes 47 by second duct cover 55.
  • a plurality of third through holes 58 are provided to the left-hand side wall of heating compartment 11 exposed to reflecting chamber 27.
  • a plurality of fourth through holes 59 also are provided to the left-hand side wall of heating compartment 11 exposed to cooking chamber 15.
  • An air discharge path 61 is established between the left-hand side wall of heating compartment 11 and the outer wall of oven body 13. As can be seen in FIGURE 1, the bottom surface of oven body 13 facing to the bottom of heating compartment 11 is concaved downward in a rectangular-shape. Each side wall of the concaved portion 63 of the bottom is slanted inward, as shown in Figure 1.
  • a plurality of air exhausting holes 65 are provided to the left-hand side wall of concaved portion 63.
  • the air from reflecting chamber 17 through third through holes 58 and the air from cooking chamber 15 through fourth through holes 59 are re-joined in air discharge path 61 into discharge air.
  • the discharge air is exhausted from exhausting holes 65 in the direction opposite to machinery chamber 27 at which air intake holes 29 are provided.
  • an elongated bar material 67 is fixed between the upper wall of oven body 13 and the ceiling of heating compartment 11.
  • An elongated bar material 69 also is provided between the bottom wall of oven body 13 and the bottom surface of heating compartment 11.
  • the both side walls and upper and lower walls of heating compartment 11 extend between the front and rear walls of oven body 13, as shown in FIGURE 3.
  • a front door 71 is hinged at the front side of oven body 13 to open and close cooking chamber 15, as shown in FIGURE 2.
  • a desired cooking time is set through an operation panel 73 on which start and stop keys, a cooking time setting knob, etc. are provided.
  • magnetron 33 When the start key (not shown) is operated, magnetron 33 is energized through transformer 31. Microwaves generated by magnetron 33 are supplied to reflecting chamber 17 from antenna 35 of magnetron 33.
  • motor 43 of fan device 37 In response to the operation of the start key, motor 43 of fan device 37 also is energized. Cooling air is taken from the atmosphere into machinery chamber 27 through air intake holes 29. Since high-voltage transformer 31 is positioned between air intake holes 29 and fan device 37, transformer 31 may be cooled by the cooling air from air intake holes 29.
  • cooling air After cooling transformer 31, the cooling air is directed into fan casing 39.
  • the cooling air is supplied to the first air path 53 from air discharge port 39b of fan casing 39.
  • the cooling air is divided into driving air and ventilating air in first air path 53.
  • the driving air enters into reflecting chamber 17 through first through holes 45.
  • the driving air concentrates on fan-like blade 21c of reflector 21 by air guide plate 49.
  • the driving air rotates reflector 21 in reflecting chamber for scattering microwaves fed from antenna 35 of magnetron 33.
  • the scattered microwaves are applied to the food on tray 25 through partition wall 19.
  • the food may be heated uniformly.
  • the driving air goes out into air discharge path 61 through third through holes 58 of reflecting chamber 17.
  • the ventilating air moves around magnetron 33 for cooling magnetron 33, and then reaches second air path 57. Furthermore, the ventilating air enters into cooking chamber 15 through second through holes 47 of cooking chamber 15. Then, the ventilating air goes out into air discharge path 61 through fourth through holes 59 of cooking chamber 15. When the ventilating air is discharged from cooking chamber 15, the ventilating air conveys the vapor and the grease from the food to the outside of cooking chamber 15.
  • the driving air and the ventilating air are re-joined in air discharge path 61 to become discharge air.
  • the discharge air finally goes out from oven body 13 through exhausting holes 65.
  • a plurality of deflecting plates 75 may be provided near exhausting holes 65 for effectively exhausting the discharge air from exhausting holes 65 away from machinery chamber 27 at which air intake holes 29 are provided, as shown in FIGURE 5.
  • the cooling air generated by the fan device is divided into driving air for rotating the reflector in reflecting chamber and ventilating air for ventilating the cooking chamber.
  • the driving air directly enters into the reflecting chamber.
  • the ventilating air by-passes the reflecting chamber and enters into the cooking chamber through a magnetron. Therefore, appropriate air for each chamber may be supplied.
  • Pressure loss of the ventilating air may be reduced, as compared with the prior art described above.
  • fan efficiency of a fan device is enhanced as a pressure loss reduces. Therefore, in this embodiment, a small capacity fan motor may be used for rotating the reflector and for ventilating the cooking chamber.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Electric Ovens (AREA)

Claims (4)

  1. Ein Mikrowellenkochgerät mit einem Außengehäuse (13); einem Heizabteil (11), das einen Reflexionsbereich und einen Kochbereich zur Aufnahme von zu kochenden Nahrungsmitteln aufweist; einem Magnetron (33) zum Erzeugen von Mikrowellen, die zum Reflexionsbereich im Heizabteil abgestrahlt werden; einem drehbaren Reflektor (21) im Reflexionsbereich zum Reflektieren der Mikrowellen auf die Nahrungsmittel im Kochbereich; einer Lufteinlaßöffnung (29); einer Ventilatoreinrichtung (37) zum Zuführen von Luft unter Druck von der Lufteinlaßöffnung (29) zum Heizabteil; einer Leitungseinrichtung, die die zugeführte Luft aufteilt in wenigstens eine erste Strömungsbahn (53) für einen Teil der Luft zwecks Drehung des Reflektors und eine zweite Strömungsbahn (57), die am Reflexionsbereich vorbeiführt und einen Teil der Luft dem Kochbereich zwecks Belüftung des Kochbereichs zuführt, und eine Luftabführbahn (61) mit einer Luftauslaßöffnung (65) zum Abführen der Luft aus dem Heizabteil (11) nach außerhalb des Kochgerätes, dadurch gekennzeichnet, daß der Teil der Luft der ersten Strömungsbahn (53) direkt von der Ventilatoreinrichtung (37) dem Reflexionsbereich zum Drehen des Reflektors (21) zugeführt wird, und daß die Bodenwand des Außengehäuses (13) einen sich nach außen erstreckenden konvexen Abschnitt aufweist, der die Auslaßöffnung (65) an der der Lufteinlaßöffnung (29) gegenüberliegenden Seitenwand enthält, um die Lufteinlaßöffnung (29) räumlich von der Luftauslaßöffnung (65) zu trennen und so eine Rezirkulation der Abluft zu verhindern.
  2. Ein Gerät nach Anspruch 1, in welchem die Leitungseinrichtung eine Luftführung (49) zum Konzentrieren der Luft von der ersten Strömungsbahn (53) auf den Reflektor aufweist.
  3. Ein Gerät nach Anspruch 1, in welchem das Heizabteil (11) eine Trennwand (19) zum Abtrennen des Kochbereichs vom Reflexionsbereich aufweist.
  4. Ein Gerät nach wenigstens einem vorhergehenden Anspruch, in welchem die Luftabführbahn (61) eine Ablenkplatte (75) aufweist, um die abgegebene Luft von der Lufteinlaßöffnung (29) wegzuführen.
EP87304625A 1986-05-31 1987-05-26 Mikrowellenkochgerät Expired EP0248580B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP126368/86 1986-05-31
JP61126369A JPH07101099B2 (ja) 1986-05-31 1986-05-31 高周波加熱装置
JP126369/86 1986-05-31
JP61126368A JPS62283593A (ja) 1986-05-31 1986-05-31 高周波加熱装置

Publications (3)

Publication Number Publication Date
EP0248580A2 EP0248580A2 (de) 1987-12-09
EP0248580A3 EP0248580A3 (en) 1989-04-19
EP0248580B1 true EP0248580B1 (de) 1992-07-29

Family

ID=26462570

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87304625A Expired EP0248580B1 (de) 1986-05-31 1987-05-26 Mikrowellenkochgerät

Country Status (4)

Country Link
US (1) US4743728A (de)
EP (1) EP0248580B1 (de)
CA (1) CA1278047C (de)
DE (1) DE3780710D1 (de)

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JP5118240B1 (ja) 2011-08-08 2013-01-16 シャープ株式会社 加熱調理器
EP2636955B1 (de) * 2012-03-08 2016-11-16 Electrolux Home Products Corporation N.V. Kochherd für Wärmeübertragung durch Konvektion
EP3035806B1 (de) 2013-08-20 2018-04-25 Whirlpool Corporation Verfahren zur erkennung des status von popcorn in einem mikrowellenofen
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JP2017528884A (ja) 2014-09-17 2017-09-28 ワールプール コーポレイション パッチアンテナを介した直接加熱
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EP3305019B1 (de) 2015-06-03 2023-07-19 Whirlpool Corporation Verfahren und vorrichtung zum elektromagnetischen kochen
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CN108702817B (zh) 2016-02-15 2021-09-10 松下电器产业株式会社 用于传送射频电磁能量以对食料进行烹调的方法和装置
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Also Published As

Publication number Publication date
CA1278047C (en) 1990-12-18
EP0248580A2 (de) 1987-12-09
US4743728A (en) 1988-05-10
DE3780710D1 (de) 1992-09-03
EP0248580A3 (en) 1989-04-19

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